Acme.BookStore.HttpApi.Host/node_modules/arr-diff/README.md
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# arr-diff [](https://www.npmjs.com/package/arr-diff) [](https://npmjs.org/package/arr-diff) [](https://travis-ci.org/jonschlinkert/arr-diff)
> Returns an array with only the unique values from the first array, by excluding all values from additional arrays using strict equality for comparisons.
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save arr-diff
```
Install with [yarn](https://yarnpkg.com):
```sh
$ yarn add arr-diff
```
Install with [bower](https://bower.io/)
```sh
$ bower install arr-diff --save
```
## Usage
Returns the difference between the first array and additional arrays.
```js
var diff = require('arr-diff');
var a = ['a', 'b', 'c', 'd'];
var b = ['b', 'c'];
console.log(diff(a, b))
//=> ['a', 'd']
```
## Benchmarks
This library versus [array-differ](https://github.com/sindresorhus/array-differ), on April 14, 2017:
```
Benchmarking: (4 of 4)
· long-dupes
· long
· med
· short
# benchmark/fixtures/long-dupes.js (100804 bytes)
arr-diff-3.0.0 x 822 ops/sec ±0.67% (86 runs sampled)
arr-diff-4.0.0 x 2,141 ops/sec ±0.42% (89 runs sampled)
array-differ x 708 ops/sec ±0.70% (89 runs sampled)
fastest is arr-diff-4.0.0
# benchmark/fixtures/long.js (94529 bytes)
arr-diff-3.0.0 x 882 ops/sec ±0.60% (87 runs sampled)
arr-diff-4.0.0 x 2,329 ops/sec ±0.97% (83 runs sampled)
array-differ x 769 ops/sec ±0.61% (90 runs sampled)
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